<template>
	<view>
		<view clas="search-box">
			<uni-search-bar @input="input" :radius="100" cancelButton="none" :focus="true">
			</uni-search-bar>
		</view>
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		<!--搜索历史  -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag customStyle="margin-top: 5px; margin-right: 10px;" :text="item" v-for="(item, i) in histories"
					@click="gotoGoodsList(item)" :key="i">
				</uni-tag>
			</view>
		</view>
	</view>
</template>


<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				// 搜索的结果列表
				searchResults: [],
				// 搜索历史的数组
				historyList: []
			};
		},
		onLoad() {
			// 调用uni.setStorageSync(key,value) 将搜索历史记录持久化存储到本地
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		},
		methods: {
			// input 输入事件的处理函数
			input(e) {
				// console.log(e)

				//清除timer对应的延时器
				clearTimeout(this.timer)
				// 重新启动一个延时器，并把timerID赋值给this.timer
				this.timer = setTimeout(() => {
					// 如果500毫秒内没有触发新的事件，则为搜索关键字赋值
					// console.log(e)
					this.kw = e
					this.getSearchList()
				}, 500)
			},
			// 根据搜索关键字，搜索商品建议列表
			async getSearchList() {
				// 判断搜索关键字是否为空
				if (this.kw.length === 0) {
					this.searchResults = []
					return
				}
				// 发起请求，获取搜索建议列表
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/goods/qsearch', {

					query: this.kw
				})
				if (res.meta.status !== 200) return uni.$showMsg()
				this.searchResults = res.message
				this.saveSearchHistory()
			},
			gotoDetail(item) {
				uni.navigateTo({
					url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
				})
			},
			saveSearchHistory() {
				// this.historyList.push(this.kw)


				const set = new Set(this.historyList)
				set.delete(this.kw)
				set.add(this.kw)
				this.historyList = Array.from(set)

				// 对搜索历史数据，进行持久化的存储
				uni.setStorageSync('kw', JSON.stringify(this.historyList))
			},
			clean() {
				this.historyList = []
				uni.setStorageSync('kw', '[]')
			},
			gotoGoodsList(kw) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?query=' + kw
				})
			}
		},
		computed: {
			histories() {
				return [...this.historyList].reverse()
			}
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
		background-color: #aaaaff;
	}

	.sugg-list {
		padding: 0 5px;

		.sugg-item {
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;

			.goods-name {
				white-space: nowrap; //文字不允许换行
				overflow: hidden; //超出区域换行
				// 文字溢出之后，使用...代替
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}

	.history-box {
		padding: 0 5px;

		.history-title {
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 13px;
			border-bottom: 1px solid #efefef;

		}

		.history-list {
			display: flex;
			flex-wrap: wrap;
		}
	}
</style>
